Evidence for suppressed metallicity on the surface of La2-xSrxCuO4 and Nd2-xCexCuO4

Abstract

Hard X-ray Photoemission spectroscopy (PES) of copper core electronic states, with a probing depth of $\sim$60 Å, is used to show that the Zhang-Rice singlet feature is present in La${}_2$CuO${}_4$ but is absent in Nd${}_2$CuO${}_4$. Hole- and electron doping in La${}_{2-x}$Sr${}_x$CuO${}_4$ (LSCO) and Nd${}_{2-x}$Ce${}_x$CuO${}_4$ (NCCO) result in new well-screened features which are missing in soft X-ray PES. Impurity Anderson model calculations establish metallic screening as its origin, which is strongly suppressed within 15 $\text{A˚}$ of the surface. Complemented with X-ray absorption spectroscopy, the small chemical-potential shift in core levels ($\sim 0.2$ eV) are shown to be consistent with modifications of valence and conduction band states spanning the band gap ($\sim 1$ eV) upon hole- and electron-doping in LSCO and NCCO.

4 pages, 4 figures

References in corpus (3)

• Nature of Well-Screened State in Hard X-ray Mn 2$p$ Core-Level Photoemission of La${}_{1-x}$Sr${}_x$MnO${}_3$ Films
• Bulk screening in core level photoemission from Mott-Hubbard and Charge-Transfer systems
• Chemical Potential Shift in Nd${}_{2-x}$Ce${}_x$CuO${}_4$: Contrasting Behaviors of the Electron- and Hole-Doped Cuprates

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